added version and ldflags example to set it

cmd/steward/main.go

@@ -13,6 +13,12 @@ import (
 	"github.com/RaaLabs/steward"
 )
 
+// Use ldflags to set version
+// env CONFIGFOLDER=./etc/ go run -ldflags "-X main.version=v0.1.10" --race ./cmd/steward/.
+// or
+// env GOOS=linux GOARCH=amd64 go build -ldflags "-X main.version=v0.1.10" -o steward
+var version string
+
 func main() {
 	// defer profile.Start(profile.CPUProfile, profile.ProfilePath(".")).Stop()
 	// defer profile.Start(profile.TraceProfile, profile.ProfilePath(".")).Stop()
@@ -33,7 +39,7 @@ func main() {
 
 	}
 
-	s, err := steward.NewServer(c)
+	s, err := steward.NewServer(c, version)
 	if err != nil {
 		log.Printf("%v\n", err)
 		os.Exit(1)

server.go

@@ -49,10 +49,12 @@ type server struct {
 	errorKernel *errorKernel
 	// metric exporter
 	metrics *metrics
+	// Version of package
+	version string
 }
 
 // newServer will prepare and return a server type
-func NewServer(c *Configuration) (*server, error) {
+func NewServer(c *Configuration, version string) (*server, error) {
 	// Set up the main background context.
 	ctx, cancel := context.WithCancel(context.Background())
 
@@ -166,6 +168,7 @@ func NewServer(c *Configuration) (*server, error) {
 		processes:     newProcesses(ctx, metrics),
 		newMessagesCh: make(chan []subjectAndMessage),
 		metrics:       metrics,
+		version:       version,
 	}
 
 	// Create the default data folder for where subscribers should
@@ -191,6 +194,8 @@ func NewServer(c *Configuration) (*server, error) {
 // if there is publisher process for a given message subject, and
 // if it does not exist it will spawn one.
 func (s *server) Start() {
+	fmt.Printf(" * VERSION = %+v\n", s.version)
+
 	// Start the error kernel that will do all the error handling
 	// that is not done within a process.
 	s.errorKernel = newErrorKernel(s.ctx)

steward_test.go

@@ -67,7 +67,7 @@ func TestStewardServer(t *testing.T) {
 		StartSubREQTailFile:        true,
 		// StartSubREQToSocket:		flagNodeSlice{OK: true, Values: []Node{"*"}},
 	}
-	stewardServer, err := NewServer(conf)
+	stewardServer, err := NewServer(conf, "test")
 	if err != nil {
 		t.Fatalf(" * failed: could not start the Steward instance %v\n", err)
 	}